<template>
  <div>
    <div class="shopcart" @click="cartFoodsShowFun">
      <div class="content">
        <div class="content-left">
          <div class="logo-wrapper">
            <div class="logo" :class="{highlight: totalCount}">
              <i class="iconfont icon-gouwuchekong" :class="{highlight: totalCount}"></i>
            </div>
            <!-- 显示购物车内食物数量totalCount -->
            <div class="num" v-if="totalCount">{{totalCount}}</div>
          </div>
          <!-- 总价格totalPrice -->
          <div class="price" :class="{highlight: totalCount}">￥{{totalPrice ? totalPrice : 0}}元</div>
          <div class="desc">另需配送费￥{{shopInfo.deliveryPrice}}元</div>
        </div>
        <div class="content-right" @click.stop="payMoney">
          <div class="pay" :class="payClass">
            {{payText}}
          </div>
        </div>
      </div>
      <transition name="move">
        <!-- 购物车内商品详情 -->
        <div class="shopcart-list" v-show="cartFoodsShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="emptyCartFoods">清空</span>
          </div>
          <div class="list-content">
            <ul>
              <li class="food" v-for="(food, index) in cartFoods" :key="index">
                  <span class="name">{{food.name}}</span>
                  <div class="price"><span>￥{{food.price}}</span></div>
                  <div class="cartcontrol-wrapper">
                    <CartControl :food="food"/>
                  </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <!-- 遮罩 -->
    <div class="list-mask" v-show="cartFoodsShow"></div>
    <i class="iconfont icon-gou1"></i>
  </div>
</template>

<script>
import {mapState, mapGetters} from 'vuex'
import CartControl from '../CartControl/CartControl.vue'
import BScroll from 'better-scroll'
import { Toast } from 'mint-ui'
export default {
  data () {
    return {
      cartFoodsShow: false
    }
  },
  computed: {
    // 购物车食物数量， 商家信息。  计算属性：购物车内总食物数量，总价格
    ...mapState(['cartFoods', 'shopInfo']),
    ...mapGetters(['totalCount', 'totalPrice']),
    payClass () {
      const {totalPrice} = this
      const {minPrice} = this.shopInfo
      return totalPrice >= minPrice ? 'enough' : 'not-enough'
    },
    payText () {
      const {totalPrice} = this
      const {minPrice} = this.shopInfo
      if (totalPrice === 0) {
        return `${minPrice}元起送`
      } else if (totalPrice < minPrice) {
        return `还差${minPrice - totalPrice}元起送`
      } else {
        return '去结算'
      }
    }
  },
  components: {
    CartControl
  },
  methods: {
    emptyCartFoods () {
      this.$store.dispatch('emptyCartFoods')
    },
    cartFoodsShowFun () {
      if (this.cartFoods.length > 0) {
        this.cartFoodsShow = !this.cartFoodsShow
        // 显示商品时，创建BScroll滑动对象
        if (this.cartFoodsShow) {
          this.$nextTick(() => { // 数据刷新，用nextTick，数据更新后执行DOM更新
          // eslint-disable-next-line no-new
            new BScroll('.list-content', {})
          })
        }

      // 显示商品时，清空购物车，发现购物车虽然内容为空但仍然显示，且由于购物车长度为0不能点击无法更改显示状态，所以强行再加条判断
      } else if (this.cartFoods.length === 0) {
        this.cartFoodsShow = false
      }
    },
    payMoney () {
      // 消息提示框
      Toast({
        message: '结算成功',
        iconClass: 'iconfont icon-gou1'
      })

      // 结算时，购物车内food列表另外保存下来
      const foods = this.cartFoods
      const shopinfo = this.shopInfo
      this.$store.dispatch('receiveFoodsInOrder', {foods, shopinfo})

      // 结算成功，清空购物车
      this.emptyCartFoods()
    }
  }
}
</script>

<style lang="stylus" rel="stylesheet/stylus" scoped>
  @import "../../common/stylus/mixins.styl"

  .shopcart
    position fixed
    left 0
    bottom 0
    z-index 50
    width 100%
    height 48px
    .content
      display flex
      background #141d27
      font-size 0
      color rgba(255, 255, 255, 0.4)
      .content-left
        flex 1
        .logo-wrapper
          display inline-block
          vertical-align top
          position relative
          top -10px
          margin 0 12px
          padding 6px
          width 56px
          height 56px
          box-sizing border-box
          border-radius 50%
          background #141d27
          .logo
            width 100%
            height 100%
            border-radius 50%
            text-align center
            background #2b343c
            &.highlight
              background rgb(65,184,131)
            .icon-gouwuchekong
              line-height 44px
              font-size 24px
              color white
              &.highlight
                color #fff
          .num
            position absolute
            top 0
            right 0
            width 24px
            height 16px
            line-height 16px
            text-align center
            border-radius 16px
            font-size 9px
            font-weight 700
            color #ffffff
            background rgb(240, 20, 20)
            box-shadow 0 4px 8px 0 rgba(0, 0, 0, 0.4)
        .price
          display inline-block
          vertical-align top
          margin-top 5px
          line-height 24px
          padding-right 12px
          box-sizing border-box
          font-size 16px
          font-weight 700
          color #fff
          &.highlight
            color #fff
        .desc
          display inline-block
          vertical-align bottom
          margin-bottom 15px
          margin-left -45px
          font-size 10px
      .content-right
        flex 0 0 105px
        width 105px
        .pay
          height 48px
          line-height 48px
          text-align center
          font-size 12px
          font-weight 700
          color #fff
          &.not-enough
            background #2b333b
          &.enough
            background rgb(65,184,131)
            color #fff
    .ball-container
      .ball
        position fixed
        left 32px
        bottom 22px
        z-index 200
        transition all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
        .inner
          width 16px
          height 16px
          border-radius 50%
          background $green
          transition all 0.4s linear
    .shopcart-list
      position absolute
      left 0
      top 0
      z-index -1
      width 100%
      transform translateY(-100%)
      &.move-enter-active, &.move-leave-active
        transition transform .3s
      &.move-enter, &.move-leave-to
        transform translateY(0)
      .list-header
        height 40px
        line-height 40px
        padding 0 18px
        background #f3f5f7
        border-bottom 1px solid rgba(7, 17, 27, 0.1)
        .title
          float left
          font-size 14px
          color rgb(7, 17, 27)
        .empty
          float right
          font-size 12px
          color rgb(0, 160, 220)

      .list-content
        padding 0 18px
        max-height 217px
        overflow hidden
        background #fff
        .food
          position relative
          padding 12px 0
          box-sizing border-box
          bottom-border-1px(rgba(7, 17, 27, 0.1))
          .name
            line-height 24px
            font-size 14px
            color rgb(7, 17, 27)
          .price
            position absolute
            right 90px
            bottom 12px
            line-height 24px
            font-size 14px
            font-weight 700
            color rgb(240, 20, 20)
          .cartcontrol-wrapper
            position absolute
            right 0
            bottom 6px

  .list-mask
    position fixed
    top 0
    left 0
    width 100%
    height 100%
    z-index 40
    backdrop-filter blur(10px)
    opacity 1
    background rgba(7, 17, 27, 0.5)
    &.fade-enter-active, &.fade-leave-active
      transition all 0.5s
    &.fade-enter, &.fade-leave-to
      opacity 0
      background rgba(7, 17, 27, 0)

  .icon-gou1
    display: none
</style>
